JP2010253514A - Nozzle for continuous casting and method for fixing screw for gas supply pipe connection in the nozzle for continuous casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle for continuous casting which includes a detent structure for preventing the rotation of a screw for gas supply pipe connection due to the connection of a gas supply pipe, and to provide a method for fixing a screw for gas supply pipe connection in the nozzle for continuous casting. <P>SOLUTION: The nozzle 1 for continuous casting includes: a gas introduction passage 4 provided at the inside of a nozzle body 2 and supplying gas into a nozzle inner hole 3; the screw 5 for gas supply pipe connection for connecting a gas supply pipe 20 supplying gas into the gas introduction passage 4 to the nozzle body 2; and an iron shell 6 wound around the nozzle body 2 near the fitting part of the screw 5 for gas supply pipe connection. The screw 5 for gas supply pipe connection has a head flange 5a provided with corner parts 5A at the outer form, and the iron shell 6 has a head flange insertion hole 6a engaged with the head flange 5a of the screw 5 for gas supply connection and making the head flange 5a nonrotatable. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a continuous casting nozzle to which a gas supply pipe connecting screw is fixed, and a method for fixing a gas supply pipe connecting screw in the continuous casting nozzle.

  Conventionally, in order to prevent components such as aluminum contained in the molten steel flowing through the nozzle bore during continuous casting from oxidizing and causing nozzle blockage, as shown in FIG. A gas introduction path (annular slit) 53 that is substantially concentric with the inner hole 52 and extends in the axial direction is formed, and an inert gas such as argon gas is supplied to the nozzle inner hole 52 through the gas introduction path 53. By supplying, the adhesion of the oxide to the inner hole is prevented.

  The present applicant has previously filed an application for the gas supply pipe connection screw 54 for connecting the gas supply pipe 20 for supplying gas into the gas introduction path 53 to the side wall of the nozzle body 51, and this gas supply pipe connection. Proposed screw structure having a polygonal head flange that prevents the gas supply pipe connection screw 54 from rotating as the gas supply pipe 20 rotates when the gas supply pipe 20 is connected (screwed) to the screw 54 (Japanese Patent No. 3727632).

When such a gas supply pipe connection screw 54 is attached to the nozzle body 51, the gas supply pipe connection screw 54 is directly attached to the screw attachment hole 55 of the nozzle body 51. However, the nozzle body 51 made of refractory is sheared. Since it does not have sufficient strength against stress, the nozzle body 51 may be destroyed when the gas supply pipe 20 is attached. In order to solve this problem, as shown in FIG. 9, the outer periphery of the nozzle body 51 in the vicinity of the portion to which the gas supply pipe connection screw 54 is attached is wound and reinforced with an iron shell 56.
Japanese Patent No. 3727632

  The present invention has been conceived so that the gas supply pipe connection screw does not rotate more reliably with the rotation of the gas supply pipe by using this iron skin. To provide a continuous casting nozzle having a detent structure in which a gas supply pipe connection screw does not rotate with the connection of the pipe, and a method of fixing the gas supply pipe connection screw in the continuous casting nozzle is there.

  In order to solve the above problems, a gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore and a gas supply pipe for supplying gas into the gas introduction path are connected to the nozzle body. A nozzle for continuous casting having a supply pipe connecting screw and an iron skin wound around a nozzle body in the vicinity of the attachment site of the gas supply pipe connecting screw, wherein the gas supply pipe connecting screw has an outer shape. A head flange having a corner portion, and the iron skin has a head flange insertion hole that engages with the head flange of the gas supply pipe connecting screw to make the head flange unrotatable. This is a continuous casting nozzle.

  Moreover, what solves the said subject is for connecting the gas supply path which is provided in a nozzle main body and can supply gas to a nozzle inner hole, and supplies the gas in this gas introduction path to a nozzle main body. A continuous casting nozzle having a gas supply pipe connecting screw and an iron skin wound around a nozzle body in the vicinity of an attachment site of the gas supply pipe connecting screw, wherein the gas supply pipe connecting screw is It has a head flange with a corner in the outer shape, the iron skin has a screw insertion hole through which the gas supply pipe connection screw can be inserted, and the gas supply pipe connection screw is fixed to the iron skin. The nozzle for continuous casting, wherein the nozzle is held by a screw fixing member that holds the head flange in a non-rotatable manner.

  Furthermore, what solves the above-mentioned problem is to connect a gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore and a gas supply pipe for supplying gas into the gas introduction path to the nozzle body. A continuous casting nozzle having a gas supply pipe connecting screw and an iron skin wound around a nozzle body in the vicinity of an attachment site of the gas supply pipe connecting screw, wherein the gas supply pipe connecting screw is A head flange having a corner portion on the outer shape, and the iron skin has a head flange insertion hole that engages with the head flange of the gas supply pipe connecting screw and makes the head flange unrotatable. The gas supply pipe connecting screw is held by the head flange fitting hole of the iron skin, and is a method for fixing a gas supply pipe connecting screw in a continuous casting nozzle.

  Furthermore, what solves the above-mentioned problem is to connect a gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore and a gas supply pipe for supplying gas into the gas introduction path to the nozzle body. A continuous casting nozzle having a gas supply pipe connecting screw and an iron skin wound around a nozzle body in the vicinity of an attachment site of the gas supply pipe connecting screw, wherein the gas supply pipe connecting screw is It has a head flange with a corner in the outer shape, the iron skin has a screw insertion hole through which the gas supply pipe connection screw can be inserted, and the gas supply pipe connection screw is fixed to the iron skin. A gas supply pipe connecting screw fixing method in a continuous casting nozzle, wherein the head flange is held by a screw fixing member that holds the head flange in a non-rotatable manner.

According to the first aspect of the present invention, the head flange insertion hole provided in the iron skin holds the head flange of the gas supply pipe connecting screw in a non-rotatable manner. The supply pipe connecting screw does not rotate.
According to the second aspect of the present invention, the screw fixing member provided on the iron skin holds the head flange of the gas supply pipe connecting screw in a non-rotatable manner. The pipe connection screw does not rotate.
According to the third aspect of the present invention, the head flange insertion hole provided in the iron skin holds the head flange of the gas supply pipe connecting screw in a non-rotatable manner. The supply pipe connecting screw does not rotate.
According to the invention described in claim 4, since the screw fixing member provided on the iron shell holds the head flange of the gas supply pipe connecting screw in a non-rotatable manner, the gas supply is performed along with the connection of the gas supply pipe. The pipe connection screw does not rotate.

It is a partial front view of one Example of the nozzle for continuous casting of this invention. It is an AA line partial expanded sectional view of FIG. It is a front view of one Example of the iron skin in the nozzle for continuous casting of this invention. FIG. 4 is a perspective view of the iron skin shown in FIG. 3. It is a partial front view of the other Example of the nozzle for continuous casting of this invention. FIG. 6 is a partial enlarged sectional view taken along line AA in FIG. 5. It is a perspective view of the other Example of the iron skin in the nozzle for continuous casting of this invention. It is a longitudinal cross-sectional view for demonstrating the nozzle for continuous casting which connects a gas supply pipe | tube. It is a partial front view for demonstrating the fixing method of the screw for gas supply pipe | tube connection in the conventional nozzle for continuous casting.

  In the present invention, the head flange of the gas supply pipe connection screw is held non-rotatably by the iron skin, so that the gas supply pipe connection screw does not rotate with the connection of the gas supply pipe. A casting nozzle was realized.

  As shown in FIG. 1 or FIG. 2, the continuous casting nozzle 1 of this embodiment includes a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3, and a gas introduction path 4. A gas supply pipe connection screw 5 for connecting a gas supply pipe 20 for supplying gas to the nozzle body 2, and an iron skin 6 wound around the nozzle body 2 near the attachment site of the gas supply pipe connection screw 5; The gas supply pipe connecting screw 5 has a head flange 5a having a corner 5A on the outer shape, and the iron skin 6 is a head flange of the gas supply pipe connecting screw 5. It has a head flange insertion hole 6a that engages with 5a to make the head flange 5a unrotatable. Hereinafter, each configuration will be described in detail.

  The continuous casting nozzle 1 is a nozzle for injecting molten metal in a tundish into a mold, and the upper part is hermetically connected to the molten steel discharge port of the tundish, and the lower part is inserted and immersed in the mold for use. Is.

  A nozzle inner hole 3 penetrates in the center of the nozzle body 2 in the axial direction, and the molten metal can be circulated through the nozzle inner hole 3. Further, a gas introduction path (annular slit) 4 is formed in the nozzle body 2 so as to be substantially concentric with the nozzle inner hole 3 and extending in the axial direction. By supplying an inert gas such as a gas to the nozzle inner hole 3, the oxide is prevented from adhering to the inner hole.

  A screw mounting hole 10 communicating with the gas introduction path 4 is formed in the side wall of the nozzle body 2, and a gas supply for supplying gas into the gas introduction path 4 as shown in FIG. A gas supply pipe connection screw 5 for connecting the pipe 20 to the nozzle body 2 is attached.

  More specifically, the screw mounting hole 10 includes a fitting hole 10a for fitting the head flange 5a of the gas supply pipe connecting screw 5, and a gas supply pipe connecting screw 5 which is coupled to the fitting hole 10a. It is comprised from the internal thread 10b which screws the external thread 5b.

  The screw 5 for connecting the gas supply pipe is integrally formed with a head hexagonal flange 5a when viewed from the front (see FIG. 1) by forging or the like, and penetrates the gas supply hole 11 substantially at the center of the screw body 5c. Then, a gas supply pipe connecting female screw 5d is formed on the inner surface of the gas supply hole 11 and a male screw 5b is formed on the outer periphery of the screw main body 5c. Each apex angle of the regular hexagonal head flange 5a constitutes a corner portion 5A for preventing rotation.

  Then, a refractory mortar 12 is filled and cured in the gap between the head flange 5a of the gas supply pipe connection screw 5 attached to the screw attachment hole 10 and the fitting hole 10a, as shown in FIG. The gas screw 5 is fixed, and the gas supply pipe 20 is configured to be connectable to the continuous casting nozzle 1.

  As shown in FIG. 1 or 2, an iron skin 6 is wound around the outer periphery of the nozzle body 2 in the vicinity of the attachment portion of the gas supply pipe connection screw 5, and the nozzle body 2 is destroyed when the gas supply pipe 20 is attached. It is reinforced so that it does not end up. As shown in FIG. 3 or FIG. 4, the iron skin 6 is formed by a belt-like body 6 b having substantially the same length as the outer periphery of the nozzle body 2, and is wound around the nozzle body 2 and then welded. The both ends of the belt-like body 6 b are connected and arranged on the outer periphery of the nozzle body 2.

  As shown in FIG. 1, the iron skin 6 engages with the head flange 5a having the corner 5A of the gas supply pipe connecting screw 5 to make the head flange 5a unrotatable. have. In this embodiment, the head flange insertion hole 6a is formed in a rectangular hole having a lateral width slightly larger than the width of the head flange 5a (the distance between two parallel sides of the regular hexagon). When the head flange 5a is arranged in the part flange insertion hole 6a, the inner edge of the head flange insertion hole 6a and the side part of the head flange 5a are engaged, and the iron skin 6 rotates the head flange 5a. It is configured to lock. The head flange insertion hole is not limited to this rectangular shape, and the head flange cannot be rotated by engaging with the head flange corresponding to the shape of the head flange having corners. If the outer shape of the head flange of the gas supply pipe connection screw is an octagon or other polygon, the head flange insertion hole is slightly larger than that. It may be an octagon or other polygons. That is, the head flange insertion hole is disposed adjacent to at least a straight portion of the outer shape of the head flange, and the inner edge portion of the head flange insertion hole and the side portion of the head flange engage to rotate the head flange. Any shape is possible as long as it can be held impossible.

  Thus, in the continuous casting nozzle 1 of the present invention, the iron skin 6 holds the head flange 5a of the gas supply pipe connecting screw 5 in a non-rotatable manner, so that the gas supply pipe connecting screw 5 has an extremely simple structure. Rotation can be more reliably suppressed.

Next, another embodiment of the continuous casting nozzle of the present invention shown in FIG. 5 or FIG. 6 will be described.
The continuous casting nozzle 30 of this embodiment includes a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3, and a gas supply pipe 20 for supplying gas into the gas introduction path 4. A continuous casting nozzle having a gas supply pipe connection screw 5 for connection to the main body 2 and an iron skin 6 wound around the nozzle main body 2 in the vicinity of the attachment site of the gas supply pipe connection screw 5. The gas supply pipe connecting screw 5 has a head flange 5a having a corner 5A on the outer shape, and the iron skin 6 has a screw insertion hole 31 through which the gas supply pipe connecting screw 5 can be inserted, so that the gas supply The pipe connecting screw 5 is fixed to the iron shell 6 and is held by screw fixing members 32a and 32b that hold the head flange 5a in a non-rotatable manner.

  The difference between the continuous casting nozzle 30 of this embodiment and the above-mentioned continuous casting nozzle 1 is that the continuous casting nozzle 1 cannot rotate the head flange 5a through the head flange insertion hole 6a provided in the iron shell 6. In contrast, the continuous casting nozzle 30 is only for locking the head flange 5a with the screw fixing members 32a and 32b fixed to the iron shell 6 by the welded portion 33. The same. The same components are denoted by the same reference numerals and description thereof is omitted.

  Specifically, as shown in FIG. 5, the iron skin 6 of the continuous casting nozzle 30 is provided with a screw insertion hole 31 having a circular shape when viewed from the front. The screw insertion hole 31 itself is connected to the head flange 5a. The screw fixing members 32a and 32b that are not engaged and are fixed to the iron shell at the welded portion 33 lock the head flange 5a in a non-rotatable manner. The screw fixing members 32a and 32b are composed of two long materials, and are arranged in parallel along a straight line portion connecting the corners of the outer shape of the head flange 5a. The head flange 5a is fixed to the iron skin 6 and is non-rotatably locked by these screw fixing members 32a and 32b. In addition, by configuring a locking member such as the screw fixing members 32a and 32b as a separate member from the iron skin 6, the head flange 5a can be mounted at any angle on the front surface of the head flange 5a. By arranging the screw fixing member along the outer shape of the head flange 5a, the head flange 5a can be locked so as not to rotate. In addition, the screw fixing member of this embodiment is composed of two long members 32a and 32b arranged in parallel, but is not limited to this, and the linear portion of the outer shape of the head flange 5a As long as it can be prevented from rotating by being arranged along and fixed, it may be in any form, and may be composed of a single material or a plurality of three or more materials.

Further, another embodiment of the iron skin used for the continuous casting nozzle of the present invention shown in FIG. 7 will be described.
The basic difference between the iron skin 46 of this embodiment and the above-described iron skin 6 is that the iron skin 6 is composed of a single belt-like body 6b, whereas the two iron skins 46 are the nozzle body. 2 is composed of two strips 46a and 46b that are divided so as to wind two.

Further, a method of fixing the gas supply pipe connecting screw in the continuous casting nozzle of the present invention will be described with reference to one embodiment shown in FIGS.
The fixing method of the gas supply pipe connection screw 5 in the continuous casting nozzle 1 of this embodiment is as follows: a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3; A gas supply pipe connection screw 5 for connecting a gas supply pipe 20 for supplying gas to the nozzle main body 2, and an iron skin 6 wound around the nozzle main body 2 in the vicinity of an attachment site of the gas supply pipe connection screw 5 The gas supply pipe connecting screw 5 has a head flange 5a having a corner 5A on its outer shape, and the iron skin 6 is the head of the gas supply pipe connecting screw 5 It has a head flange insertion hole 6a that engages with the flange 5a so that the head flange 5a cannot rotate, and the gas supply pipe connection screw 5 is held by the head flange insertion hole 6a of the iron skin 6. The fixing method characterized by the above.

  In this method of fixing the gas supply pipe connecting screw 5 in the continuous casting nozzle 1, a head provided with a corner 5 </ b> A of the gas supply pipe connecting screw 5 in a head flange fitting hole 6 a provided in the iron skin 6. The head flange 5a can be made non-rotatable only by engaging the flange 5a. More specifically, the head flange insertion hole 6a is formed in a rectangular hole having a lateral width slightly larger than the width of the head flange 5a (the distance between two parallel sides of the regular hexagon). When the head flange 5a is arranged in the head flange insertion hole 6a, the inner edge portion of the head flange insertion hole 6a and the side portion of the head flange 5a are engaged, and the iron 6 is rotated by the head flange 5a. Lock and fix.

Furthermore, another method for fixing the gas supply pipe connecting screw in the continuous casting nozzle of the present invention will be described with reference to one embodiment shown in FIG. 5 or FIG.
The fixing method of the gas supply pipe connecting screw 5 in the continuous casting nozzle 30 of this embodiment is as follows: a gas introduction path 4 provided in the nozzle body 2 and capable of supplying gas to the nozzle inner hole 3; A gas supply pipe connection screw 5 for connecting a gas supply pipe 20 for supplying gas to the nozzle main body 2, and an iron skin 6 wound around the nozzle main body 2 in the vicinity of an attachment site of the gas supply pipe connection screw 5 The gas supply pipe connection screw 5 has a head flange 5a having a corner 5A on the outer shape, and the iron skin 6 can be inserted through the gas supply pipe connection screw 5. The gas supply pipe connecting screw 5 is fixed to the iron skin 6 and is held by screw fixing members 32a and 32b that hold the head flange 5a in a non-rotatable manner. It is a fixing method.

  In this embodiment, first, in a state where the gas supply pipe connection screw 5 is exposed in the screw insertion hole 31 of the iron skin 6, the iron skin 6 is disposed on the outer periphery of the nozzle body 2 near the attachment portion of the gas supply pipe connection screw 5. Wind up to reinforce.

  Next, as shown in FIG. 5, the head flange 5a is held unrotatable by the screw fixing members 32a and 32b. Specifically, the screw fixing members 32a and 32b are composed of two long materials, and are arranged in parallel along the straight line portion of the outer shape of the head flange 5a, and then are attached to the welded portion 33. The head flange 5a is locked and fixed in a non-rotatable manner by being secured to the iron skin 6.

  Thus, according to the fixing method of the gas supply pipe connecting screw in the continuous casting nozzle of the present invention, the rotation of the gas supply pipe connecting screw 5 can be more reliably suppressed with a simple structure and a simple method.

DESCRIPTION OF SYMBOLS 1 Nozzle for continuous casting 2 Nozzle main body 3 Nozzle inner hole 4 Gas introduction path 5 Gas supply pipe connection screw 5A Corner | angular part 5a Head flange 5b Male screw 5c Screw main-body part 5d Gas supply pipe connection female screw 6 Iron skin 10 Screw Mounting hole 10a Fitting hole 10b Female thread 11 Gas supply hole 12 Refractory mortar 20 Gas supply pipe

Claims (4)

  A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore; a gas supply pipe connection screw for connecting a gas supply pipe for supplying gas into the gas introduction path to the nozzle body; and A continuous casting nozzle having an iron skin wound around a nozzle body in the vicinity of an attachment site of a gas supply pipe connection screw, wherein the gas supply pipe connection screw has a head flange having a corner portion on its outer shape. And the iron skin has a head flange insertion hole which engages with the head flange of the gas supply pipe connecting screw and makes the head flange non-rotatable. Nozzle for casting.   A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore; a gas supply pipe connection screw for connecting a gas supply pipe for supplying gas into the gas introduction path to the nozzle body; and A continuous casting nozzle having an iron skin wound around a nozzle body in the vicinity of an attachment site of a gas supply pipe connection screw, wherein the gas supply pipe connection screw has a head flange having a corner portion on its outer shape. The iron skin has a screw insertion hole through which the gas supply pipe connection screw can be inserted, and the gas supply pipe connection screw is fixed to the iron skin and holds the head flange in a non-rotatable manner. A nozzle for continuous casting, which is held by a screw fixing member.   A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore; a gas supply pipe connection screw for connecting a gas supply pipe for supplying gas into the gas introduction path to the nozzle body; and A continuous casting nozzle having an iron skin wound around a nozzle body in the vicinity of an attachment site of a gas supply pipe connection screw, wherein the gas supply pipe connection screw has a head flange having a corner portion on its outer shape. The iron skin has a head flange fitting hole that engages with the head flange of the gas supply pipe connecting screw and makes the head flange unrotatable, and the gas supply pipe connecting screw Is held by the head flange insertion hole of the iron skin, and a method for fixing a gas supply pipe connecting screw in a continuous casting nozzle.   A gas introduction path provided in the nozzle body and capable of supplying gas to the nozzle bore; a gas supply pipe connection screw for connecting a gas supply pipe for supplying gas into the gas introduction path to the nozzle body; and A continuous casting nozzle having an iron skin wound around a nozzle body in the vicinity of an attachment site of a gas supply pipe connection screw, wherein the gas supply pipe connection screw has a head flange having a corner portion on its outer shape. The iron skin has a screw insertion hole through which the gas supply pipe connection screw can be inserted, and the gas supply pipe connection screw is fixed to the iron skin and holds the head flange in a non-rotatable manner. A method of fixing a screw for connecting a gas supply pipe in a nozzle for continuous casting, characterized by being held by a screw fixing member.

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